The Signals > Setups filter dropdowns (Direction, Recommended Action) opened UNDER the panels below: glass containers use backdrop-filter, which creates a stacking context, so the menu's z-50 could never compete with later sibling panels regardless of value. The menu now portals to document.body with fixed positioning tracked against the trigger (re-measured on scroll/resize), and click-outside accounts for the portaled node. Applies to every Dropdown usage. Menu background also updated from the old green-tinted #151911 to the Horizon #14161f. Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>